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Fixes crash when 'use selected' checkbox is check but no features are selected. Fixes #2504.

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git-svn-id: http://svn.osgeo.org/qgis/trunk@13031 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
cfarmer 2010-03-08 23:43:55 +00:00
parent 428b72812b
commit f60dda6be9
1 changed files with 39 additions and 33 deletions
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72
python/plugins/fTools/tools/doVisual.py
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@ -237,8 +237,9 @@ class visualThread( QThread ):
if self.mySelection: # only selected features if self.mySelection: # only selected features
selection = vlayer.selectedFeatures() selection = vlayer.selectedFeatures()
nFeat = vlayer.selectedFeatureCount() nFeat = vlayer.selectedFeatureCount()
self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), 0 ) if nFeat > 0:
self.emit( SIGNAL( "runRange(PyQt_PyObject)" ), ( 0, nFeat ) ) self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), 0 )
self.emit( SIGNAL( "runRange(PyQt_PyObject)" ), ( 0, nFeat ) )
for f in selection: for f in selection:
atMap = f.attributeMap() atMap = f.attributeMap()
lenVal = float( len( atMap[ index ].toString() ) ) lenVal = float( len( atMap[ index ].toString() ) )
@ -281,16 +282,18 @@ class visualThread( QThread ):
nElement += 1 nElement += 1
self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nElement ) self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nElement )
nVal= float( len( values ) ) nVal= float( len( values ) )
if nVal > 0.00: if nVal > 0:
meanVal = sumVal / nVal meanVal = sumVal / nVal
lstStats = [] lstStats = []
lstStats.append( self.tr( "Max. len:" ) + unicode( maxVal ) ) lstStats.append( self.tr( "Max. len:" ) + unicode( maxVal ) )
lstStats.append( self.tr( "Min. len:" ) + unicode( minVal ) ) lstStats.append( self.tr( "Min. len:" ) + unicode( minVal ) )
lstStats.append( self.tr( "Mean. len:" ) + unicode( meanVal ) ) lstStats.append( self.tr( "Mean. len:" ) + unicode( meanVal ) )
lstStats.append( self.tr( "Filled:" ) + unicode( fillVal ) ) lstStats.append( self.tr( "Filled:" ) + unicode( fillVal ) )
lstStats.append( self.tr( "Empty:" ) + unicode( emptyVal ) ) lstStats.append( self.tr( "Empty:" ) + unicode( emptyVal ) )
lstStats.append( self.tr( "N:" ) + unicode( nVal ) ) lstStats.append( self.tr( "N:" ) + unicode( nVal ) )
return ( lstStats, [] ) return ( lstStats, [] )
else:
return ( ["Error:No features selected!"], [] )
else: # numeric field else: # numeric field
stdVal = 0.00 stdVal = 0.00
cvVal = 0.00 cvVal = 0.00
@ -302,8 +305,9 @@ class visualThread( QThread ):
selection = vlayer.selectedFeatures() selection = vlayer.selectedFeatures()
nFeat = vlayer.selectedFeatureCount() nFeat = vlayer.selectedFeatureCount()
uniqueVal = ftools_utils.getUniqueValuesCount( vlayer, index, True ) uniqueVal = ftools_utils.getUniqueValuesCount( vlayer, index, True )
self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), 0 ) if nFeat > 0:
self.emit( SIGNAL( "runRange(PyQt_PyObject)" ), ( 0, nFeat ) ) self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), 0 )
self.emit( SIGNAL( "runRange(PyQt_PyObject)" ), ( 0, nFeat ) )
for f in selection: for f in selection:
atMap = f.attributeMap() atMap = f.attributeMap()
value = float( atMap[ index ].toDouble()[ 0 ] ) value = float( atMap[ index ].toDouble()[ 0 ] )
@ -339,33 +343,35 @@ class visualThread( QThread ):
nElement += 1 nElement += 1
self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nElement ) self.emit( SIGNAL( "runStatus(PyQt_PyObject)" ), nElement )
nVal= float( len( values ) ) nVal= float( len( values ) )
rangeVal = maxVal - minVal
if nVal > 0.00: if nVal > 0.00:
rangeVal = maxVal - minVal
meanVal = sumVal / nVal meanVal = sumVal / nVal
if meanVal != 0.00: if meanVal != 0.00:
for val in values: for val in values:
stdVal += ( ( val - meanVal ) * ( val - meanVal ) ) stdVal += ( ( val - meanVal ) * ( val - meanVal ) )
stdVal = math.sqrt( stdVal / nVal ) stdVal = math.sqrt( stdVal / nVal )
cvVal = stdVal / meanVal cvVal = stdVal / meanVal
if nVal > 1: if nVal > 1:
lstVal = values lstVal = values
lstVal.sort() lstVal.sort()
if ( nVal % 2 ) == 0: if ( nVal % 2 ) == 0:
medianVal = 0.5 * ( lstVal[ int( ( nVal - 1 ) / 2 ) ] + lstVal[ int( ( nVal ) / 2 ) ] ) medianVal = 0.5 * ( lstVal[ int( ( nVal - 1 ) / 2 ) ] + lstVal[ int( ( nVal ) / 2 ) ] )
else: else:
medianVal = lstVal[ int( ( nVal + 1 ) / 2 ) ] medianVal = lstVal[ int( ( nVal + 1 ) / 2 ) ]
lstStats = [] lstStats = []
lstStats.append( self.tr( "Mean:" ) + unicode( meanVal ) ) lstStats.append( self.tr( "Mean:" ) + unicode( meanVal ) )
lstStats.append( self.tr( "StdDev:" ) + unicode( stdVal ) ) lstStats.append( self.tr( "StdDev:" ) + unicode( stdVal ) )
lstStats.append( self.tr( "Sum:" ) + unicode( sumVal) ) lstStats.append( self.tr( "Sum:" ) + unicode( sumVal) )
lstStats.append( self.tr( "Min:" ) + unicode( minVal ) ) lstStats.append( self.tr( "Min:" ) + unicode( minVal ) )
lstStats.append( self.tr( "Max:" ) + unicode( maxVal ) ) lstStats.append( self.tr( "Max:" ) + unicode( maxVal ) )
lstStats.append( self.tr( "N:" ) + unicode( nVal ) ) lstStats.append( self.tr( "N:" ) + unicode( nVal ) )
lstStats.append( self.tr( "CV:" ) + unicode( cvVal ) ) lstStats.append( self.tr( "CV:" ) + unicode( cvVal ) )
lstStats.append( self.tr( "Number of unique values:" ) + unicode( uniqueVal ) ) lstStats.append( self.tr( "Number of unique values:" ) + unicode( uniqueVal ) )
lstStats.append( self.tr( "Range:" ) + unicode( rangeVal ) ) lstStats.append( self.tr( "Range:" ) + unicode( rangeVal ) )
lstStats.append( self.tr( "Median:" ) + unicode( medianVal ) ) lstStats.append( self.tr( "Median:" ) + unicode( medianVal ) )
return ( lstStats, [] ) return ( lstStats, [] )
else:
return ( ["Error:No features selected!"], [] )
def nearest_neighbour_analysis( self, vlayer ): def nearest_neighbour_analysis( self, vlayer ):
vprovider = vlayer.dataProvider() vprovider = vlayer.dataProvider()